core/tests/Drupal/KernelTests/Config/TypedConfigTest.php | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php b/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php
index adba8b8e0b..e46e0f4b49 100644
--- a/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php
+++ b/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php
@@ -169,9 +169,13 @@ public function testSimpleConfigValidation() {
     $value['zebra'] = 'foo';
     $typed_config->setValue($value);
     $result = $typed_config->validate();
-    $this->assertCount(1, $result);
+    $this->assertCount(3, $result);
     $this->assertEquals('', $result->get(0)->getPropertyPath());
-    $this->assertEquals('Unexpected keys: elephant, zebra', $result->get(0)->getMessage());
+    $this->assertEquals("'elephant' is not a supported key.", $result->get(0)->getMessage());
+    $this->assertEquals('', $result->get(1)->getPropertyPath());
+    $this->assertEquals("'zebra' is not a supported key.", $result->get(1)->getMessage());
+    $this->assertEquals('', $result->get(2)->getPropertyPath());
+    $this->assertEquals('Unexpected keys: elephant, zebra', $result->get(2)->getMessage());
   }
 
 }